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Akari (satellite)

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For other uses, seeAkari (disambiguation).

AKARI
Artist's conception of AKARI
Mission typeInfraredtelescope
OperatorJAXA
COSPAR ID2006-005AEdit this at Wikidata
SATCATno.28939
Websiteglobal.jaxa.jp/projects/sat/astro_f/
Mission duration5 years, 9 months
Spacecraft properties
ManufacturerISAS
Launch mass952 kg (2,099 lb)
Dimensions5.5 m × 1.9 m × 3.2 m (18.0 ft × 6.2 ft × 10.5 ft)
Start of mission
Launch date21:28, 21 February 2006 (UTC)(2006-02-21T21:28UTC)[1]
RocketM-V,mission M-V-8
Launch siteM-V Pad,Uchinoura Space Center
End of mission
Disposaldecommissioned
Deactivated24 November 2011(2011-11-24)
Decay date11 April 2023, 04:44 UTC
Orbital parameters
Reference systemGeocentric
RegimeSun-synchronous
Semi-major axis6,884 km (4,278 mi)[2]
Eccentricity0.0129527[2]
Perigee altitude423.9 km (263.4 mi)[2]
Apogee altitude602.3 km (374.3 mi)[2]
Inclination98.2 degrees[2]
Period94.7 minutes[2]
RAAN305.9392 degrees[2]
Argument of perigee124.2012 degrees[2]
Mean anomaly354.1441 degrees[2]
Mean motion15.1995622 rev/day[2]
Epoch9 July 2015, 13:43:21 UTC[2]
Revolutionno.50455[2]
Main
TypeRitchey–Chrétien
Diameter0.67 m (2.2 ft)
Focal length4.2 m (14 ft)
Wavelengths1.7 to 180μm(Infrared)
Instruments
FIS:Far-Infrared Surveyor
IRC:Infra-Red Camera

AKARI(ASTRO-F) was aninfrared astronomysatellitedeveloped byJapan Aerospace Exploration Agency,in cooperation with institutes of Europe and Korea. It was launched on 21 February 2006, at 21:28UTC(06:28, 22 FebruaryJST) byM-V rocketinto EarthSun-synchronous orbit.After its launch it was namedAKARI( minh かり), which meanslightin Japanese. Earlier on, the project was known asIRIS(InfraRed Imaging Surveyor).

Its primary mission was to survey the entire sky in near-, mid- andfar-infrared,through its 68.5 cm (27.0 in) aperture telescope.[3]

Technical design[edit]

Its designed lifespan, of far- and mid-infrared sensors, was 550 days, limited by its liquidheliumcoolant.[4]

Its telescope mirror was made ofsilicon carbideto save weight. The budget for the satellite was¥13,4 billion (~US$110 million).[5]

History[edit]

By mid-August 2006, AKARI finished around 50 per cent of the all sky survey.[6]

By early November 2006, first (phase-1) all-sky survey finished. Second (phase-2) all-sky survey started on 10 November 2006.[7]

Due to the malfunction ofSun sensorafter the launch, ejection of telescopeaperturelid was delayed, resulting in the coolant lifespan estimate being shortened to about 500 days from launch. However, after JAXA estimated the remaining helium during early March 2007, observation time was extended at least until 9 September.[8]

On 11 July 2007, JAXA informed that 90 per cent of the sky was scanned twice. Also around 3,500 selected targets have been observed so far.[9]

On 26 August 2007, liquid-Helium coolant depleted, which means the completion of far- and mid-infrared observation. More than 96 per cent of the sky was scanned and more than 5,000 pointed observations were done.[10]

British and Japanese project team members were awarded aDaiwa Adrian Prizein 2004, by theDaiwa Anglo-Japanese Foundationin recognition of their collaboration.[11]

During December 2007, JAXA performed orbit correction manoeuvres to bring AKARI back into its ideal orbit. This was necessary because the boiled offheliumled to an increase in altitude. If this had continued, the energy supply would have been cut off.[12]

2008-2010[edit]

A limited observation 'warm' programme continued with just NIR.

End of mission[edit]

In May 2011, AKARI suffered a major electrical failure and the batteries could not take full charge from the solar panels. As a result, its science instruments were rendered inoperable when the satellite was in the Earth's shadow.[3]The operation of satellite was terminated officially on 24 November 2011.[13]The satellite reentered the atmosphere on 11 April 2023 at 04:44 UTC.[14]

Results[edit]

The AKARI All-Sky Survey Point Source Catalogues was released on 30 March 2010.[16][17][18]

Astronomy and Astrophysics,Vol. 514 (May 2010) was a feature issue of AKARI's results.[19]

See also[edit]

References[edit]

  1. ^Stephen Clark (21 February 2006)."Japanese infrared space observatory goes into orbit".Spaceflight Now.Retrieved20 February2010.
  2. ^abcdefghijkl"ATRO-F (AKARI) Satellite details 2006-005A NORAD 28939".N2YO. 6 July 2015.Retrieved6 July2015.
  3. ^ab"JAXA Hopes To Keep AKARI Going Despite Power Failure".Space News International.27 May 2011. Archived fromthe originalon 3 February 2013.Retrieved17 August2011.
  4. ^"The Infrared Astronomical Satellite AKARI and Nikon".Nikon. September 2007. Archived fromthe originalon 2 March 2013.Retrieved26 November2011.
  5. ^"Fueling trust in rocket science".The Japan Times.28 February 2006. Archived fromthe originalon 4 March 2006.Retrieved16 May2010.
  6. ^Issei Yamamura (August 2006)."AKARI Mission Lifetime".AKARI Newsletter.Vol. 16. Archived fromthe originalon 25 May 2011.Retrieved16 May2010.
  7. ^"The Infrared Astronomical Satellite AKARI and Nikon".Nikon. September 2007. Archived fromthe originalon 11 May 2010.Retrieved16 May2010.
  8. ^Issei Yamamura (9 March 2007)."AKARI Cryogenic Lifetime".AKARI Newsletter.Vol. 18. Archived fromthe originalon 25 May 2011.Retrieved16 May2010.
  9. ^"Current Status of the AKARI Mission After one year of observations".Archived fromthe originalon 31 July 2007.Retrieved12 July2007.
  10. ^Usui, Fumihiko; Kuroda, Daisuke; MÜLler, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; Kataza, Hirokazu; Takita, Satoshi; Oyabu, Shinki; Ueno, Munetaka; Matsuhara, Hideo; Onaka, Takashi (2011). "Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey".Publications of the Astronomical Society of Japan.63(5): 1117–1138.Bibcode:2011PASJ...63.1117U.doi:10.1093/pasj/63.5.1117.ISSN0004-6264.
  11. ^"Daiwa Adrian Prizes - Prizes for UK-Japan Scientific Collaboration"(PDF).Retrieved20 November2022.
  12. ^Issei Yamamura (26 February 2008)."Happy Birthday, AKARI!".AKARI Newsletter.Vol. 21. Archived fromthe originalon 25 May 2011.Retrieved16 May2010.
  13. ^"Xích ngoại tuyến thiên văn vệ tinh “あかり” ( ASTRO-F ) の vận dụng kết thúc について "(in Japanese). JAXA. 24 November 2011.Retrieved24 November2011.
  14. ^Joseph Remis [@jremis] (11 April 2023)."Actual decay 04h44mn 26°N 49°W"(Tweet) – viaTwitter.
  15. ^"AKARI (ASTRO-F) Results".JAXA/ISAS/LIRA. 28 November 2008. Archived fromthe originalon 25 May 2011.Retrieved16 May2010.
  16. ^"Tân nhiều thế hệ の xích ngoại tuyến thiên thể カタログ, Nhật Bản から thế giới に công khai へ"(Press release) (in Japanese). 30 March 2010.Archivedfrom the original on 2 April 2010.Retrieved30 March2010.
  17. ^"DARTS/AKARI at ISAS/JAXA".
  18. ^"AKARI | Research | Archive | PSC".
  19. ^Bertout, C. (May 2010)."Special feature on AKARI results".Astronomy and Astrophysics.514:E1.Bibcode:2010A&A...514E...1B.doi:10.1051/0004-6361/201014744.ISSN0004-6361.Archivedfrom the original on 26 February 2021.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Akari_(satellite)&oldid=1224277638"